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Commit | Line | Data |
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77d8bf9c ACM |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic INET transport hashtables | |
7 | * | |
8 | * Authors: Lotsa people, from code originally in tcp | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
2d8c4ce5 | 16 | #include <linux/module.h> |
a7f5e7f1 | 17 | #include <linux/random.h> |
f3f05f70 | 18 | #include <linux/sched.h> |
77d8bf9c | 19 | #include <linux/slab.h> |
f3f05f70 | 20 | #include <linux/wait.h> |
77d8bf9c | 21 | |
463c84b9 | 22 | #include <net/inet_connection_sock.h> |
77d8bf9c | 23 | #include <net/inet_hashtables.h> |
a7f5e7f1 | 24 | #include <net/ip.h> |
77d8bf9c ACM |
25 | |
26 | /* | |
27 | * Allocate and initialize a new local port bind bucket. | |
28 | * The bindhash mutex for snum's hash chain must be held here. | |
29 | */ | |
e18b890b | 30 | struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep, |
941b1d22 | 31 | struct net *net, |
77d8bf9c ACM |
32 | struct inet_bind_hashbucket *head, |
33 | const unsigned short snum) | |
34 | { | |
54e6ecb2 | 35 | struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC); |
77d8bf9c ACM |
36 | |
37 | if (tb != NULL) { | |
7a9546ee | 38 | write_pnet(&tb->ib_net, hold_net(net)); |
77d8bf9c ACM |
39 | tb->port = snum; |
40 | tb->fastreuse = 0; | |
41 | INIT_HLIST_HEAD(&tb->owners); | |
42 | hlist_add_head(&tb->node, &head->chain); | |
43 | } | |
44 | return tb; | |
45 | } | |
46 | ||
77d8bf9c ACM |
47 | /* |
48 | * Caller must hold hashbucket lock for this tb with local BH disabled | |
49 | */ | |
e18b890b | 50 | void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb) |
77d8bf9c ACM |
51 | { |
52 | if (hlist_empty(&tb->owners)) { | |
53 | __hlist_del(&tb->node); | |
7a9546ee | 54 | release_net(ib_net(tb)); |
77d8bf9c ACM |
55 | kmem_cache_free(cachep, tb); |
56 | } | |
57 | } | |
2d8c4ce5 ACM |
58 | |
59 | void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, | |
60 | const unsigned short snum) | |
61 | { | |
463c84b9 | 62 | inet_sk(sk)->num = snum; |
2d8c4ce5 | 63 | sk_add_bind_node(sk, &tb->owners); |
463c84b9 | 64 | inet_csk(sk)->icsk_bind_hash = tb; |
2d8c4ce5 ACM |
65 | } |
66 | ||
2d8c4ce5 ACM |
67 | /* |
68 | * Get rid of any references to a local port held by the given sock. | |
69 | */ | |
ab1e0a13 | 70 | static void __inet_put_port(struct sock *sk) |
2d8c4ce5 | 71 | { |
39d8cda7 | 72 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
7f635ab7 PE |
73 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->num, |
74 | hashinfo->bhash_size); | |
2d8c4ce5 ACM |
75 | struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash]; |
76 | struct inet_bind_bucket *tb; | |
77 | ||
78 | spin_lock(&head->lock); | |
463c84b9 | 79 | tb = inet_csk(sk)->icsk_bind_hash; |
2d8c4ce5 | 80 | __sk_del_bind_node(sk); |
463c84b9 ACM |
81 | inet_csk(sk)->icsk_bind_hash = NULL; |
82 | inet_sk(sk)->num = 0; | |
2d8c4ce5 ACM |
83 | inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); |
84 | spin_unlock(&head->lock); | |
85 | } | |
86 | ||
ab1e0a13 | 87 | void inet_put_port(struct sock *sk) |
2d8c4ce5 ACM |
88 | { |
89 | local_bh_disable(); | |
ab1e0a13 | 90 | __inet_put_port(sk); |
2d8c4ce5 ACM |
91 | local_bh_enable(); |
92 | } | |
93 | ||
94 | EXPORT_SYMBOL(inet_put_port); | |
f3f05f70 | 95 | |
53083773 PE |
96 | void __inet_inherit_port(struct sock *sk, struct sock *child) |
97 | { | |
98 | struct inet_hashinfo *table = sk->sk_prot->h.hashinfo; | |
7f635ab7 PE |
99 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(child)->num, |
100 | table->bhash_size); | |
53083773 PE |
101 | struct inet_bind_hashbucket *head = &table->bhash[bhash]; |
102 | struct inet_bind_bucket *tb; | |
103 | ||
104 | spin_lock(&head->lock); | |
105 | tb = inet_csk(sk)->icsk_bind_hash; | |
106 | sk_add_bind_node(child, &tb->owners); | |
107 | inet_csk(child)->icsk_bind_hash = tb; | |
108 | spin_unlock(&head->lock); | |
109 | } | |
110 | ||
111 | EXPORT_SYMBOL_GPL(__inet_inherit_port); | |
112 | ||
f3f05f70 ACM |
113 | /* |
114 | * This lock without WQ_FLAG_EXCLUSIVE is good on UP and it can be very bad on SMP. | |
115 | * Look, when several writers sleep and reader wakes them up, all but one | |
116 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves | |
117 | * this, _but_ remember, it adds useless work on UP machines (wake up each | |
118 | * exclusive lock release). It should be ifdefed really. | |
119 | */ | |
120 | void inet_listen_wlock(struct inet_hashinfo *hashinfo) | |
9a429c49 | 121 | __acquires(hashinfo->lhash_lock) |
f3f05f70 ACM |
122 | { |
123 | write_lock(&hashinfo->lhash_lock); | |
124 | ||
125 | if (atomic_read(&hashinfo->lhash_users)) { | |
126 | DEFINE_WAIT(wait); | |
127 | ||
128 | for (;;) { | |
129 | prepare_to_wait_exclusive(&hashinfo->lhash_wait, | |
130 | &wait, TASK_UNINTERRUPTIBLE); | |
131 | if (!atomic_read(&hashinfo->lhash_users)) | |
132 | break; | |
133 | write_unlock_bh(&hashinfo->lhash_lock); | |
134 | schedule(); | |
135 | write_lock_bh(&hashinfo->lhash_lock); | |
136 | } | |
137 | ||
138 | finish_wait(&hashinfo->lhash_wait, &wait); | |
139 | } | |
140 | } | |
141 | ||
33b62231 ACM |
142 | /* |
143 | * Don't inline this cruft. Here are some nice properties to exploit here. The | |
144 | * BSD API does not allow a listening sock to specify the remote port nor the | |
145 | * remote address for the connection. So always assume those are both | |
146 | * wildcarded during the search since they can never be otherwise. | |
147 | */ | |
c67499c0 PE |
148 | static struct sock *inet_lookup_listener_slow(struct net *net, |
149 | const struct hlist_head *head, | |
fb99c848 | 150 | const __be32 daddr, |
8f491069 HX |
151 | const unsigned short hnum, |
152 | const int dif) | |
33b62231 ACM |
153 | { |
154 | struct sock *result = NULL, *sk; | |
155 | const struct hlist_node *node; | |
156 | int hiscore = -1; | |
157 | ||
158 | sk_for_each(sk, node, head) { | |
159 | const struct inet_sock *inet = inet_sk(sk); | |
160 | ||
878628fb | 161 | if (net_eq(sock_net(sk), net) && inet->num == hnum && |
c67499c0 | 162 | !ipv6_only_sock(sk)) { |
fb99c848 | 163 | const __be32 rcv_saddr = inet->rcv_saddr; |
33b62231 ACM |
164 | int score = sk->sk_family == PF_INET ? 1 : 0; |
165 | ||
166 | if (rcv_saddr) { | |
167 | if (rcv_saddr != daddr) | |
168 | continue; | |
169 | score += 2; | |
170 | } | |
171 | if (sk->sk_bound_dev_if) { | |
172 | if (sk->sk_bound_dev_if != dif) | |
173 | continue; | |
174 | score += 2; | |
175 | } | |
176 | if (score == 5) | |
177 | return sk; | |
178 | if (score > hiscore) { | |
179 | hiscore = score; | |
180 | result = sk; | |
181 | } | |
182 | } | |
183 | } | |
184 | return result; | |
185 | } | |
e48c414e | 186 | |
99a92ff5 | 187 | /* Optimize the common listener case. */ |
c67499c0 PE |
188 | struct sock *__inet_lookup_listener(struct net *net, |
189 | struct inet_hashinfo *hashinfo, | |
fb99c848 | 190 | const __be32 daddr, const unsigned short hnum, |
8f491069 | 191 | const int dif) |
99a92ff5 HX |
192 | { |
193 | struct sock *sk = NULL; | |
194 | const struct hlist_head *head; | |
195 | ||
196 | read_lock(&hashinfo->lhash_lock); | |
2086a650 | 197 | head = &hashinfo->listening_hash[inet_lhashfn(net, hnum)]; |
99a92ff5 HX |
198 | if (!hlist_empty(head)) { |
199 | const struct inet_sock *inet = inet_sk((sk = __sk_head(head))); | |
200 | ||
201 | if (inet->num == hnum && !sk->sk_node.next && | |
202 | (!inet->rcv_saddr || inet->rcv_saddr == daddr) && | |
203 | (sk->sk_family == PF_INET || !ipv6_only_sock(sk)) && | |
878628fb | 204 | !sk->sk_bound_dev_if && net_eq(sock_net(sk), net)) |
99a92ff5 | 205 | goto sherry_cache; |
c67499c0 | 206 | sk = inet_lookup_listener_slow(net, head, daddr, hnum, dif); |
99a92ff5 HX |
207 | } |
208 | if (sk) { | |
209 | sherry_cache: | |
210 | sock_hold(sk); | |
211 | } | |
212 | read_unlock(&hashinfo->lhash_lock); | |
213 | return sk; | |
214 | } | |
8f491069 | 215 | EXPORT_SYMBOL_GPL(__inet_lookup_listener); |
a7f5e7f1 | 216 | |
c67499c0 PE |
217 | struct sock * __inet_lookup_established(struct net *net, |
218 | struct inet_hashinfo *hashinfo, | |
77a5ba55 PE |
219 | const __be32 saddr, const __be16 sport, |
220 | const __be32 daddr, const u16 hnum, | |
221 | const int dif) | |
222 | { | |
223 | INET_ADDR_COOKIE(acookie, saddr, daddr) | |
224 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); | |
225 | struct sock *sk; | |
3ab5aee7 | 226 | const struct hlist_nulls_node *node; |
77a5ba55 PE |
227 | /* Optimize here for direct hit, only listening connections can |
228 | * have wildcards anyways. | |
229 | */ | |
9f26b3ad | 230 | unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport); |
3ab5aee7 ED |
231 | unsigned int slot = hash & (hashinfo->ehash_size - 1); |
232 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; | |
77a5ba55 | 233 | |
3ab5aee7 ED |
234 | rcu_read_lock(); |
235 | begin: | |
236 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
c67499c0 | 237 | if (INET_MATCH(sk, net, hash, acookie, |
3ab5aee7 ED |
238 | saddr, daddr, ports, dif)) { |
239 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) | |
240 | goto begintw; | |
241 | if (unlikely(!INET_MATCH(sk, net, hash, acookie, | |
242 | saddr, daddr, ports, dif))) { | |
243 | sock_put(sk); | |
244 | goto begin; | |
245 | } | |
246 | goto out; | |
247 | } | |
77a5ba55 | 248 | } |
3ab5aee7 ED |
249 | /* |
250 | * if the nulls value we got at the end of this lookup is | |
251 | * not the expected one, we must restart lookup. | |
252 | * We probably met an item that was moved to another chain. | |
253 | */ | |
254 | if (get_nulls_value(node) != slot) | |
255 | goto begin; | |
77a5ba55 | 256 | |
3ab5aee7 | 257 | begintw: |
77a5ba55 | 258 | /* Must check for a TIME_WAIT'er before going to listener hash. */ |
3ab5aee7 | 259 | sk_nulls_for_each_rcu(sk, node, &head->twchain) { |
c67499c0 | 260 | if (INET_TW_MATCH(sk, net, hash, acookie, |
3ab5aee7 ED |
261 | saddr, daddr, ports, dif)) { |
262 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) { | |
263 | sk = NULL; | |
264 | goto out; | |
265 | } | |
266 | if (unlikely(!INET_TW_MATCH(sk, net, hash, acookie, | |
267 | saddr, daddr, ports, dif))) { | |
268 | sock_put(sk); | |
269 | goto begintw; | |
270 | } | |
271 | goto out; | |
272 | } | |
77a5ba55 | 273 | } |
3ab5aee7 ED |
274 | /* |
275 | * if the nulls value we got at the end of this lookup is | |
276 | * not the expected one, we must restart lookup. | |
277 | * We probably met an item that was moved to another chain. | |
278 | */ | |
279 | if (get_nulls_value(node) != slot) | |
280 | goto begintw; | |
77a5ba55 PE |
281 | sk = NULL; |
282 | out: | |
3ab5aee7 | 283 | rcu_read_unlock(); |
77a5ba55 | 284 | return sk; |
77a5ba55 PE |
285 | } |
286 | EXPORT_SYMBOL_GPL(__inet_lookup_established); | |
287 | ||
a7f5e7f1 ACM |
288 | /* called with local bh disabled */ |
289 | static int __inet_check_established(struct inet_timewait_death_row *death_row, | |
290 | struct sock *sk, __u16 lport, | |
291 | struct inet_timewait_sock **twp) | |
292 | { | |
293 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
294 | struct inet_sock *inet = inet_sk(sk); | |
fb99c848 AV |
295 | __be32 daddr = inet->rcv_saddr; |
296 | __be32 saddr = inet->daddr; | |
a7f5e7f1 ACM |
297 | int dif = sk->sk_bound_dev_if; |
298 | INET_ADDR_COOKIE(acookie, saddr, daddr) | |
4f765d84 | 299 | const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport); |
9f26b3ad PE |
300 | struct net *net = sock_net(sk); |
301 | unsigned int hash = inet_ehashfn(net, daddr, lport, saddr, inet->dport); | |
a7f5e7f1 | 302 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
230140cf | 303 | rwlock_t *lock = inet_ehash_lockp(hinfo, hash); |
a7f5e7f1 | 304 | struct sock *sk2; |
3ab5aee7 | 305 | const struct hlist_nulls_node *node; |
a7f5e7f1 ACM |
306 | struct inet_timewait_sock *tw; |
307 | ||
308 | prefetch(head->chain.first); | |
230140cf | 309 | write_lock(lock); |
a7f5e7f1 ACM |
310 | |
311 | /* Check TIME-WAIT sockets first. */ | |
3ab5aee7 | 312 | sk_nulls_for_each(sk2, node, &head->twchain) { |
a7f5e7f1 ACM |
313 | tw = inet_twsk(sk2); |
314 | ||
c67499c0 PE |
315 | if (INET_TW_MATCH(sk2, net, hash, acookie, |
316 | saddr, daddr, ports, dif)) { | |
a7f5e7f1 ACM |
317 | if (twsk_unique(sk, sk2, twp)) |
318 | goto unique; | |
319 | else | |
320 | goto not_unique; | |
321 | } | |
322 | } | |
323 | tw = NULL; | |
324 | ||
325 | /* And established part... */ | |
3ab5aee7 | 326 | sk_nulls_for_each(sk2, node, &head->chain) { |
c67499c0 PE |
327 | if (INET_MATCH(sk2, net, hash, acookie, |
328 | saddr, daddr, ports, dif)) | |
a7f5e7f1 ACM |
329 | goto not_unique; |
330 | } | |
331 | ||
332 | unique: | |
333 | /* Must record num and sport now. Otherwise we will see | |
334 | * in hash table socket with a funny identity. */ | |
335 | inet->num = lport; | |
336 | inet->sport = htons(lport); | |
337 | sk->sk_hash = hash; | |
547b792c | 338 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 339 | __sk_nulls_add_node_rcu(sk, &head->chain); |
c29a0bc4 | 340 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
230140cf | 341 | write_unlock(lock); |
a7f5e7f1 ACM |
342 | |
343 | if (twp) { | |
344 | *twp = tw; | |
de0744af | 345 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); |
a7f5e7f1 ACM |
346 | } else if (tw) { |
347 | /* Silly. Should hash-dance instead... */ | |
348 | inet_twsk_deschedule(tw, death_row); | |
de0744af | 349 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); |
a7f5e7f1 ACM |
350 | |
351 | inet_twsk_put(tw); | |
352 | } | |
353 | ||
354 | return 0; | |
355 | ||
356 | not_unique: | |
230140cf | 357 | write_unlock(lock); |
a7f5e7f1 ACM |
358 | return -EADDRNOTAVAIL; |
359 | } | |
360 | ||
361 | static inline u32 inet_sk_port_offset(const struct sock *sk) | |
362 | { | |
363 | const struct inet_sock *inet = inet_sk(sk); | |
e905a9ed | 364 | return secure_ipv4_port_ephemeral(inet->rcv_saddr, inet->daddr, |
a7f5e7f1 ACM |
365 | inet->dport); |
366 | } | |
367 | ||
ab1e0a13 | 368 | void __inet_hash_nolisten(struct sock *sk) |
152da81d | 369 | { |
39d8cda7 | 370 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
3ab5aee7 | 371 | struct hlist_nulls_head *list; |
152da81d PE |
372 | rwlock_t *lock; |
373 | struct inet_ehash_bucket *head; | |
374 | ||
547b792c | 375 | WARN_ON(!sk_unhashed(sk)); |
152da81d PE |
376 | |
377 | sk->sk_hash = inet_sk_ehashfn(sk); | |
378 | head = inet_ehash_bucket(hashinfo, sk->sk_hash); | |
379 | list = &head->chain; | |
380 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
381 | ||
382 | write_lock(lock); | |
3ab5aee7 | 383 | __sk_nulls_add_node_rcu(sk, list); |
c29a0bc4 | 384 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
152da81d PE |
385 | write_unlock(lock); |
386 | } | |
387 | EXPORT_SYMBOL_GPL(__inet_hash_nolisten); | |
388 | ||
ab1e0a13 | 389 | static void __inet_hash(struct sock *sk) |
152da81d | 390 | { |
39d8cda7 | 391 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
152da81d PE |
392 | struct hlist_head *list; |
393 | rwlock_t *lock; | |
394 | ||
395 | if (sk->sk_state != TCP_LISTEN) { | |
ab1e0a13 | 396 | __inet_hash_nolisten(sk); |
152da81d PE |
397 | return; |
398 | } | |
399 | ||
547b792c | 400 | WARN_ON(!sk_unhashed(sk)); |
152da81d PE |
401 | list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
402 | lock = &hashinfo->lhash_lock; | |
403 | ||
404 | inet_listen_wlock(hashinfo); | |
405 | __sk_add_node(sk, list); | |
c29a0bc4 | 406 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
152da81d PE |
407 | write_unlock(lock); |
408 | wake_up(&hashinfo->lhash_wait); | |
409 | } | |
ab1e0a13 ACM |
410 | |
411 | void inet_hash(struct sock *sk) | |
412 | { | |
413 | if (sk->sk_state != TCP_CLOSE) { | |
414 | local_bh_disable(); | |
415 | __inet_hash(sk); | |
416 | local_bh_enable(); | |
417 | } | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(inet_hash); | |
420 | ||
421 | void inet_unhash(struct sock *sk) | |
422 | { | |
423 | rwlock_t *lock; | |
39d8cda7 | 424 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
ab1e0a13 ACM |
425 | |
426 | if (sk_unhashed(sk)) | |
427 | goto out; | |
428 | ||
429 | if (sk->sk_state == TCP_LISTEN) { | |
430 | local_bh_disable(); | |
431 | inet_listen_wlock(hashinfo); | |
432 | lock = &hashinfo->lhash_lock; | |
3ab5aee7 ED |
433 | if (__sk_del_node_init(sk)) |
434 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
ab1e0a13 ACM |
435 | } else { |
436 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
437 | write_lock_bh(lock); | |
3ab5aee7 ED |
438 | if (__sk_nulls_del_node_init_rcu(sk)) |
439 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
ab1e0a13 ACM |
440 | } |
441 | ||
ab1e0a13 ACM |
442 | write_unlock_bh(lock); |
443 | out: | |
444 | if (sk->sk_state == TCP_LISTEN) | |
445 | wake_up(&hashinfo->lhash_wait); | |
446 | } | |
447 | EXPORT_SYMBOL_GPL(inet_unhash); | |
152da81d | 448 | |
5ee31fc1 | 449 | int __inet_hash_connect(struct inet_timewait_death_row *death_row, |
5d8c0aa9 | 450 | struct sock *sk, u32 port_offset, |
5ee31fc1 PE |
451 | int (*check_established)(struct inet_timewait_death_row *, |
452 | struct sock *, __u16, struct inet_timewait_sock **), | |
ab1e0a13 | 453 | void (*hash)(struct sock *sk)) |
a7f5e7f1 ACM |
454 | { |
455 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
456 | const unsigned short snum = inet_sk(sk)->num; | |
e905a9ed YH |
457 | struct inet_bind_hashbucket *head; |
458 | struct inet_bind_bucket *tb; | |
a7f5e7f1 | 459 | int ret; |
3b1e0a65 | 460 | struct net *net = sock_net(sk); |
a7f5e7f1 | 461 | |
e905a9ed | 462 | if (!snum) { |
227b60f5 | 463 | int i, remaining, low, high, port; |
a7f5e7f1 | 464 | static u32 hint; |
5d8c0aa9 | 465 | u32 offset = hint + port_offset; |
a7f5e7f1 | 466 | struct hlist_node *node; |
e905a9ed | 467 | struct inet_timewait_sock *tw = NULL; |
a7f5e7f1 | 468 | |
227b60f5 | 469 | inet_get_local_port_range(&low, &high); |
a25de534 | 470 | remaining = (high - low) + 1; |
227b60f5 | 471 | |
e905a9ed | 472 | local_bh_disable(); |
227b60f5 SH |
473 | for (i = 1; i <= remaining; i++) { |
474 | port = low + (i + offset) % remaining; | |
7f635ab7 PE |
475 | head = &hinfo->bhash[inet_bhashfn(net, port, |
476 | hinfo->bhash_size)]; | |
e905a9ed | 477 | spin_lock(&head->lock); |
a7f5e7f1 | 478 | |
e905a9ed YH |
479 | /* Does not bother with rcv_saddr checks, |
480 | * because the established check is already | |
481 | * unique enough. | |
482 | */ | |
a7f5e7f1 | 483 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
7a9546ee | 484 | if (ib_net(tb) == net && tb->port == port) { |
547b792c | 485 | WARN_ON(hlist_empty(&tb->owners)); |
e905a9ed YH |
486 | if (tb->fastreuse >= 0) |
487 | goto next_port; | |
5ee31fc1 PE |
488 | if (!check_established(death_row, sk, |
489 | port, &tw)) | |
e905a9ed YH |
490 | goto ok; |
491 | goto next_port; | |
492 | } | |
493 | } | |
494 | ||
941b1d22 PE |
495 | tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, |
496 | net, head, port); | |
e905a9ed YH |
497 | if (!tb) { |
498 | spin_unlock(&head->lock); | |
499 | break; | |
500 | } | |
501 | tb->fastreuse = -1; | |
502 | goto ok; | |
503 | ||
504 | next_port: | |
505 | spin_unlock(&head->lock); | |
506 | } | |
507 | local_bh_enable(); | |
508 | ||
509 | return -EADDRNOTAVAIL; | |
a7f5e7f1 ACM |
510 | |
511 | ok: | |
512 | hint += i; | |
513 | ||
e905a9ed YH |
514 | /* Head lock still held and bh's disabled */ |
515 | inet_bind_hash(sk, tb, port); | |
a7f5e7f1 | 516 | if (sk_unhashed(sk)) { |
e905a9ed | 517 | inet_sk(sk)->sport = htons(port); |
ab1e0a13 | 518 | hash(sk); |
e905a9ed YH |
519 | } |
520 | spin_unlock(&head->lock); | |
a7f5e7f1 | 521 | |
e905a9ed YH |
522 | if (tw) { |
523 | inet_twsk_deschedule(tw, death_row); | |
524 | inet_twsk_put(tw); | |
525 | } | |
a7f5e7f1 ACM |
526 | |
527 | ret = 0; | |
528 | goto out; | |
e905a9ed | 529 | } |
a7f5e7f1 | 530 | |
7f635ab7 | 531 | head = &hinfo->bhash[inet_bhashfn(net, snum, hinfo->bhash_size)]; |
e905a9ed | 532 | tb = inet_csk(sk)->icsk_bind_hash; |
a7f5e7f1 ACM |
533 | spin_lock_bh(&head->lock); |
534 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
ab1e0a13 | 535 | hash(sk); |
a7f5e7f1 ACM |
536 | spin_unlock_bh(&head->lock); |
537 | return 0; | |
538 | } else { | |
539 | spin_unlock(&head->lock); | |
540 | /* No definite answer... Walk to established hash table */ | |
5ee31fc1 | 541 | ret = check_established(death_row, sk, snum, NULL); |
a7f5e7f1 ACM |
542 | out: |
543 | local_bh_enable(); | |
544 | return ret; | |
545 | } | |
546 | } | |
5ee31fc1 PE |
547 | |
548 | /* | |
549 | * Bind a port for a connect operation and hash it. | |
550 | */ | |
551 | int inet_hash_connect(struct inet_timewait_death_row *death_row, | |
552 | struct sock *sk) | |
553 | { | |
5d8c0aa9 | 554 | return __inet_hash_connect(death_row, sk, inet_sk_port_offset(sk), |
5ee31fc1 PE |
555 | __inet_check_established, __inet_hash_nolisten); |
556 | } | |
a7f5e7f1 ACM |
557 | |
558 | EXPORT_SYMBOL_GPL(inet_hash_connect); |